Faune pollinisatrice, paysage et échelle spatiale des flux de pollen chez brassica napus l. (brassicaceae)

Abstract : Interest in pollen-borne gene dispersal has grown with the cultivation of genetically modified plants. To date both experimental data and models of oilseed rape (OSR) Brassica napus pollen movement at the landscape scale do not clearly differentiate between wind- and insect-mediated dispersal. Estimations of pollen-borne gene dispersal would be valuable for managing potential escapes of transgenes. Our study provides clear evidence that a large variety of insect species can transfer viable pollen between oilseed rape plants over considerable distances (>1.1 km). Insect's diversity according to geographical site and years. However, the majority of pollinator have OSR pollen in their body hairs, only 39.4% of the insects caught on male-sterile flowers carried OSR pollen. Although we could not determine with precision the role of the wind and the insects in the OSR pollination, it would seem that insects take part in a more important way in pollination of plants present in edges of fields, thus increasing cross pollination rate. Our results provide valuable data to improve models of pollen dispersal for entomophilous crops at the landscape scale. These models are essential to help land-managers reduce pollen-borne gene dispersal from genetically modified plants to wild relative and field planted with non-GM crops
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Vegetal Biology. Université d'Avignon, 2010. French. <NNT : 2010AVIG0632>


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Rémy Chifflet. Faune pollinisatrice, paysage et échelle spatiale des flux de pollen chez brassica napus l. (brassicaceae). Vegetal Biology. Université d'Avignon, 2010. French. <NNT : 2010AVIG0632>. <tel-00633180>

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